What is the current light schedule? I grow outside mostly, my LEDs do not have veg/flower settings, I would turn them to flower as soon as they show flowers. At this point I dont think switching to 12/12s will make much if any difference. Though the foxtails suggest excessive heat or light it could be in its genetics.
What is the temps and RH?​
Me Myself and I would let it play for a while yet, maybe 2 weeks and watch it close for changes.